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By fixing these issues early in the process, development teams can reduce the total cost of ownership of their applications. Discovering issues late in the SDLC can result in a 100-fold increase in the development cost needed to fix those issues, as seen in the chart below. Back in 1970, most attacks required physical access to a terminal on the machine running the application. The world was also a lot less interconnected, reducing the risk of external actors impacting application security. As new software development methodologies were put into practice over the years, security was rarely put in the spotlight within the SDLC.

In this early phase, requirements for new features are collected from various stakeholders. It’s important to identify any security considerations for functional requirements being gathered for the new release. How the SDLC will cover and satisfy overall requirements should be determined before embarking on a new project so you can achieve the best results. Once that step is done, you can select the right SDLC methodology or a hybrid of models that is perfectly suited to your main project requirements and expected end result. In the fifth phase, systems integration and testing are carried out by Quality Assurance (QA) professionals. They will be responsible for determining if the proposed design reaches the initial business goals set by the company.

How to Ensure SSDLC?

It’s possible for testing to be repeated, specifically to check for bugs, interoperability, and errors. The main purpose of this step is to identify the scope of the problem and come up with different solutions. Some of the things to consider here include costs, benefits, time, resources, and so on.

system development phase

It also helps to reduce the frequency of mistakes, assuring consistent performance. The benefits of SDLC are limitless, and its implementation protects your business system development phase from financial risks, reputational damage, and legal penalties. In addition, specialists save time and resources through early misconception detection.


All of these builds are provided in iterations, and each iteration lasts from one to three weeks. Requirements Gathering stage need teams to get detailed and precise requirements. This helps companies to finalize the necessary timeline to finish the work of that system. Where an existing system or application is in place, parallel testing ensures that the functions within a simulated production environment are equivalent to the existing process.

  • It involves designing the system’s architecture, database structure, and user interface, and defining system components.
  • SDLC methodologies fit within a flexibility spectrum ranging from agile to iterative to sequential.
  • This is the part when a network engineer, software developer, and/or programmer are brought on to conduct major work on the system.
  • In this phase, developers start build the entire system by writing code using the chosen programming language.
  • This allows the issues to be fixed by the domain experts who wrote the software rather than having a different team fix the bugs as an afterthought.

The system development life cycle involves end-to-end people, processes and technology deployments, which includes software, infrastructure and change management. The software development life cycle focuses exclusively on software components, such as development planning, technical architecture, software quality testing and the actual deployment of the software. Put simply, the system development life cycle is more holistic and comprehensive. An SDLC (software development life cycle) is a big-picture breakdown of all the steps involved in software creation (planning, coding, testing, deploying, etc.).

X-Force releases detection & response framework for managed file transfer software

This may involve training users, deploying hardware, and loading information from the prior system. The system receives a wide range of inputs, and its output, behavior, and operation are all subject to scrutiny. The importance of testing to customer satisfaction is growing, and it doesn’t even need technical expertise in areas like coding or hardware setup, or design to carry out. Users themselves or a specialized group of in-house staff members may do the testing. Control may be methodical and automated to guarantee the system to deliver the expected outcomes. CI/CD (Continuous Integration and Continuous Delivery) is a set of practices and methods that speed up software delivery by introducing automation into an SDLC.

system development phase

The secure software development life cycle is critical in any software development project. These phases don’t always flow in a neat order, and you may sometimes move back and forth between different stages of the cycle as needed. However, when it comes to secure software development, this process is the best available and can help ensure that you create the best software product. Functional specifications should include security-related information such as technical features (e.g., access controls) and operational practices (e.g., awareness and training). Information security teams should review and provide feedback on this document prior to the detailed design phase. Implementing SDLC security affects every phase of the software development process.

What Are the Five Phases of the Secure Software Development Life Cycle?

A company with the right culture is more likely to collaborate and help each other. By following a structured process, teams will monitor if their product meets the expectations of their clients and any issues or bugs are addressed quickly. An SDLC defines a sequence of activities during software creation, whereas STLC (Software Testing Life Cycle) refers to a step-by-step list of activities required for reliable software testing. The big bang model is a high-risk SDLC type that throws most of its resources at development without requiring an in-depth analysis at the start of the cycle. The agile methodology relies on ongoing release cycles that make small, incremental changes to the previous release. Builds evolve as teams add new features and improvements with each deployment.

Phase 3 defines the necessary specifications, operations, and features that will satisfy all functional requirements of the proposed system. It’s where end users can discuss and identify their specific business information needs for the application. During this phase, users will consider the important components, networking capabilities, and procedures to accomplish the project’s primary objectives. Having a system development life cycle is essential as it serves as a platform to transform an idea into a functional and fully-operational system. A post-implementation review ensures that the system or application is operating at a satisfactory level. This review involves soliciting user feedback on the overall effectiveness of the project and achievement of the requirements, timelines, etc.

The Benefits of SDLC

Start building your development around a strict Software Development Life Cycle and stay a step ahead of competitors still relying on an old-school approach to product design. The agile model requires the team to work in sprints that last for 2 to 4 weeks, each with unique requirements and goals. At the end of a sprint, the product owner verifies the code and greenlights its deployment to users.

Fundamentally, SDLC trades flexibility for control by imposing structure. Baselines[clarification needed] are established after four of the five phases of the SDLC, and are critical to the iterative nature of the model.[21] Baselines become milestones. At the same time, some experts describe the Waterfall model as obsolete and it should not be used for new projects. Remember that you do not have to pick only one of the models discussed above—many companies benefit from combining two or more SDLC methodologies into a unique hybrid model that fits their specific use case. Most teams rely on automated tests to speed up this phase, but some manual examinations are also valuable (penetration tests are a good example).

More from Application Security

The spiral methodology is a combination of rapid prototyping and concurrency in design and development activities. Agile methodology is a practice which promotes continue interaction of development and testing during the SDLC process of any project. In the Agile method, the entire project is divided into small incremental builds.


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